EP0923972B1 - Selfwashable device for separating and filtering solid particles in a liquid flow and use in a fuel injection system provided with such a device - Google Patents

Selfwashable device for separating and filtering solid particles in a liquid flow and use in a fuel injection system provided with such a device Download PDF

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Publication number
EP0923972B1
EP0923972B1 EP98403188A EP98403188A EP0923972B1 EP 0923972 B1 EP0923972 B1 EP 0923972B1 EP 98403188 A EP98403188 A EP 98403188A EP 98403188 A EP98403188 A EP 98403188A EP 0923972 B1 EP0923972 B1 EP 0923972B1
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EP
European Patent Office
Prior art keywords
liquid
outlet
tangential
case
self
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Expired - Lifetime
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EP98403188A
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German (de)
French (fr)
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EP0923972A1 (en
Inventor
Jean-Marie Brocard
Michel François Le Texier
Alain Sartori
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Safran Transmission Systems SAS
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Hispano Suiza SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
    • B01D29/115—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration open-ended, the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate

Definitions

  • the invention relates to a self-cleaning separation device. and filtration of solid particles in a flow of liquid and an application of this device in a circuit fuel injection.
  • the liquid In many devices using liquids under high pressure, the liquid must be perfectly filtered to avoid wear caused by its contaminants. he is common to satisfy this condition by means of a filter cartridge which can be replaced when it is clogged. It is also common to mount a pressure relief valve. bypass which allows the liquid to circulate while avoiding a clogged cartridge. Filter status must be checked regularly so as to avoid rapid deterioration expensive devices that the filter is designed to protect.
  • Known self-cleaning filters generally include a filter cartridge fitted with a central duct through which the main flow of the fuel flow. To power metering devices and fuel injection, part of the fuel is taken from the central duct of the filter, then is filtered through the filter cartridge.
  • the downside of filters known washes is that in order for the washing effect to be effective, they can only filter a small amount of fuel flow versus the amount of flow of fuel entering the filter.
  • the amount of flow of filtered fuel is generally less than 10% of the total amount of fuel flow entering the filter. Therefore, the sizing of the surface of the filter cartridge of filter is all the more important as the amount of fuel flow to be filtered is large.
  • the self-cleaning filters therefore generally have a mass and a large size.
  • the object of the invention is to provide a device self-cleaning particle separation and filtration solids in a cluttered liquid flow and a reduced mass and allowing to increase the ratio between the amount of filtered liquid flow and the amount of liquid flow entering the filter while ensuring effective washing of the filter cloth.
  • the invention relates to a self-washing device for separation and filtration in which the particles denser solids are separated by centrifugal effect to protect the filter cloth from being too large pollution.
  • the separated solid particles are directly routed to the filter outlet and the liquid flow which passes through the filter cloth contains only residual solid particles of low density which remain trapped in small proportion on the canvas surface filtering, most of the particles being entrained by the fluid velocity parallel to the surface of the fabric.
  • the self-washing device for separation and filtration of solid particles in a liquid flow is defined by the features of claim 1.
  • the invention also relates to an application of the device autolavable to a fuel injection system characterized in that the tangential entry of liquid is connected downstream of a high pressure pump, the outlet tangential of liquid is connected upstream of a filter main through a bypass valve the longitudinal outlet of filtered liquid is connected to a fuel metering device.
  • the self-washing device for separation and filtration of solid particles in a liquid flow has a casing 10 of tubular shape having a wall peripheral, an upper wall, a lower wall, a internal chamber 11 delimited by said walls of the casing, a tangential inlet 12 of liquid opening into the internal chamber 11 near the upper wall of the casing 10 and a tangential outlet 13 of liquid arranged at near the bottom wall of the housing 10.
  • a canvas tubular filter 14 is mounted longitudinally in the internal chamber 11, between the upper walls and lower.
  • the filter cloth 14 has a central duct longitudinal 15 opening into at least one outlet 16 of filtered liquid, the longitudinal outlet 16 being arranged in the upper and / or lower wall housing 10.
  • the tangential configuration of the liquid inlet 12 creates a vortex in the internal chamber 11 to separate the heaviest solid particles by effect centrifugal and drag them to the tangential outlet 13 of fluid.
  • the flow of liquid passing through the filter cloth contains only low density residual particles which preserves the filter cloth from too much great pollution and increase the amount of flow of liquid filtered in relation to the flow of inlet liquid without increase the size of the self-cleaning device by separation and filtration.
  • the surface inside of the housing is in the form of a spiral to constitute a volute 31.
  • This shape keeps the radial flow velocities VR and tangential VT of liquid flow around the filter cloth 14, which ensures a uniform distribution of the flow of filtered liquid over the entire lateral surface of the filter cloth and a uniform distribution of the tangential speed VT of washing in order to avoid the presence of areas of accumulation of pollutants.
  • the surface internal of the housing is also in a spiral to constitute a volute 32 of inverted shape with respect to that of the inlet volute to facilitate the evacuation of particles solids towards the tangential outlet 13.
  • the input 12 can be an opening of thin occupying the entire length of the casing 10 so that the VORTEX has a homogeneous speed of rotation throughout room 11.
  • the internal sections of the casing 10 are increasing and those of the filter cloth 14 are decreasing in order to minimize the pressure losses of the flow of liquid between the tangential inlet and the tangential liquid outlet.
  • the filter cloth is advantageously constituted, as shown in FIG. 2, by the combination of two filtration zones 21, 22 having different arresting powers.
  • the two filtration zones are arranged in the same internal chamber 11 of the casing 10 and separated by a watertight partition 23.
  • the first filtration zone 21 having a stopping power coarse has a longitudinal central duct opening out in a first longitudinal outlet 16 of filtered liquid fitted in the upper wall of the casing 10 and intended to be connected to the filtered fuel injection device.
  • the second filtration zone 22 having more stopping power end has a longitudinal central duct opening into a second longitudinal outlet 17 for filtered liquid fitted in the lower wall of the casing 10 and intended to be connected to the servo devices.
  • a flow of liquid containing solid particles to be separated and filtered arrive under high pressure in the internal chamber 11 of the casing 10 through the inlet tangential 12 with a tangential speed VT with respect to with the filter cloth 14.
  • the liquid flow is entrained in a helical movement creating a vortex in the chamber internal 11 between the filter cloth 14 and the wall housing peripheral 10.
  • the densest solid particles contained in the liquid flow are propelled towards the outside of the vortex along the peripheral wall of the casing 10, then toward the bottom wall of the housing 10. These solid particles most of them are discharged directly to the tangential outlet 13 of liquid.
  • Liquid flow rid of the densest solid particles but containing fine residual solid particles is entrained in the center of the vortex with a tangential speed high compared to the surface of the filter cloth.
  • a first part of the liquid flow located in the center of the vortex crosses the mesh of the filter cloth 14 at the surface of which residual solid particles remain trapped.
  • the flow of filtered fluid flows into the longitudinal central duct of the filter cloth, then is routed to the longitudinal outlet of filtered liquid.
  • the second part of the liquid flow is directed to the tangential outlet 13 of the liquid with a speed high tangential to the surface of the canvas filter 14.
  • this second part of the flow of liquid removes fine particles trapped on the surface of the filter cloth and leads them to the outlet tangential 13 of liquid, which has the effect of washing the filter cloth permanently for the duration of operation of the separation and filtration device.
  • This second part of the unfiltered liquid flow causes also gradually the most solid particles dense propelled outside the vortex, towards the exit tangential 13 of liquid.
  • the separation of polluting particles by means of a centrifugation removes these polluting particles from the filter cloth and increase the amount of flow of liquid withdrawn through the filter cloth relative to to the amount of the filter fabric wash flow all retaining an effective washing effect.
  • Strengthening the washing effect by the separating effect increases the filtered flow ratio up to 50% of the incoming flow without increase the dimensions of the surface of the filter cloth.
  • the separation and filtration device allows a gain of mass and size and allows to better guarantee the pointlessness of a surveillance or maintenance.
  • FIG. 5 represents a diagram of an example of application of the separation and filtration device in a circuit fuel injection.
  • the fuel injection circuit includes a low pump pressure 41 which receives fuel from a booster pump not shown located in a fuel tank. This flow fuel is sent to a high pressure pump 42 at through a main filter 43 located upstream.
  • the fuel flow Q1 passes through a separation and filtration device autolavable 44 according to the invention.
  • the device separation and filtration 44 has an inlet and a tangential fuel outlet and a filter cloth provided a longitudinal central duct leading to an outlet longitudinal of filtered liquid.
  • the longitudinal exit is connected to a fuel metering device 45 at the outlet from which the metered fuel flow is directed to fuel injectors 46.
  • a debit sample of Q2 fuel is carried through the filter cloth to supply the fuel metering device.
  • the flow fuel not withdrawn Q3 is evacuated to the outlet tangential of fuel by entraining all the particles solids separated by centrifugal effect and all particles trapped on the surface of the filter cloth.
  • the fuel flow Q3 is then directed back through a bypass valve 47 upstream of the filter main 43.
  • the opening of the bypass valve 47 is controlled by a pressure difference detector 48 connected in parallel with the metering device 45.
  • the command issued by the pressure difference detector 48 is designed to keep the PAV-PAM pressure difference across the device dosage 45.
  • the servo devices are not shown on the fuel injection system of figure 5 and the self-washing device has a structure conforming to that shown in Figure 1.
  • the device washable For application to a fuel injection system comprising servo devices, the device washable must have a structure conforming to that shown in Figure 2.

Description

L'invention concerne un dispositif autolavable de séparation et de filtration de particules solides dans un débit de liquide et une application de ce dispositif dans un circuit d'injection en carburant.The invention relates to a self-cleaning separation device. and filtration of solid particles in a flow of liquid and an application of this device in a circuit fuel injection.

Dans de nombreux dispositifs utilisant des liquides sous pression élevée, il faut que le liquide soit parfaitement filtré pour éviter l'usure provoquée par ses contaminants. Il est courant de satisfaire à cette condition au moyen d'une cartouche filtrante qui peut être remplacée lorsqu'elle est colmatée. Il est aussi courant de monter une soupape de dérivation qui permet de faire circuler le liquide en évitant une cartouche colmatée. L'état du filtre doit être contrôlé régulièrement de manière à éviter une détérioration rapide des appareils coûteux que le filtre est destiné à protéger.In many devices using liquids under high pressure, the liquid must be perfectly filtered to avoid wear caused by its contaminants. he is common to satisfy this condition by means of a filter cartridge which can be replaced when it is clogged. It is also common to mount a pressure relief valve. bypass which allows the liquid to circulate while avoiding a clogged cartridge. Filter status must be checked regularly so as to avoid rapid deterioration expensive devices that the filter is designed to protect.

Dans le cas particulier d'un système d'alimentation et de dosage du carburant d'une turbomachine comportant généralement une pompe à engrenages, par exemple de type volumétrique, un dispositif de dosage de débit et des injecteurs de carburant, il est nécessaire de protéger ce système d'une contamination externe provenant des réservoirs de carburant et de protéger le dispositif de dosage et les injecteurs de la contamination due à des particules d'usure produites par la pompe, voire à une dégradation de la pompe. Cependant, cette double protection ne peut pas être obtenue en utilisant un seul filtre. Par ailleurs, l'utilisation de deux filtres placés respectivement en amont et en aval de la pompe entraine des difficultés d'installation, une augmentation de la masse du moteur, des opérations de maintenance supplémentaires et une difficulté fonctionnelle due aux fortes pressions en aval de la pompe. Par ailleurs ces systèmes introduisent des pertes de charge non négligeables qui augmentent en fonction du degré de colmatage du filtre.In the particular case of a supply system and metering the fuel of a turbomachine comprising generally a gear pump, for example of the type volumetric, a flow metering device and fuel injectors it is necessary to protect this external contamination system from tanks protect the metering device and the wear particles contamination injectors produced by the pump, or even damage to the pump. However, this double protection cannot be obtained using a single filter. In addition, the use of two filters placed respectively upstream and downstream of the pump causes installation difficulties, a increase in engine mass, additional maintenance and functional difficulty due to high pressures downstream of the pump. otherwise these systems introduce pressure losses not negligible which increase according to the degree of clogging of the filter.

Pour s'affranchir des problèmes de maintenance du filtre disposé en aval de la pompe, il est possible d'utiliser un filtre autolavable. Les filtres autolavables connus comportent généralement une cartouche filtrante munie d'un conduit central dans lequel passe l'écoulement principal du débit de carburant. Pour alimenter les dispositifs de dosage et d'injection de carburant, une partie du carburant est prélevé dans le conduit central du filtre, puis est filtré au-travers la cartouche filtrante. L'inconvénient des filtres autolavables connus est que, pour que l'effet de lavage soit efficace, ils ne peuvent filtrer qu'une faible quantité de débit de carburant par rapport à la quantité de débit de carburant entrant dans le filtre. La quantité de débit de carburant filtré est généralement inférieure à 10% de la quantité totale du débit de carburant entrant dans le filtre. Par conséquent, le dimensionnement de la surface de la cartouche filtrante du filtre est d'autant plus important que la quantité de débit de carburant à filtrer est grande. Les filtres autolavables présentent donc généralement une masse et un encombrement important.To get rid of filter maintenance problems located downstream of the pump, it is possible to use a self-cleaning filter. Known self-cleaning filters generally include a filter cartridge fitted with a central duct through which the main flow of the fuel flow. To power metering devices and fuel injection, part of the fuel is taken from the central duct of the filter, then is filtered through the filter cartridge. The downside of filters known washes is that in order for the washing effect to be effective, they can only filter a small amount of fuel flow versus the amount of flow of fuel entering the filter. The amount of flow of filtered fuel is generally less than 10% of the total amount of fuel flow entering the filter. Therefore, the sizing of the surface of the filter cartridge of filter is all the more important as the amount of fuel flow to be filtered is large. The self-cleaning filters therefore generally have a mass and a large size.

Il existe également des filtres autolavables à effet centrifuge tels que ceux décrits notamment dans les brevets US 3807 568 et US 3718 258. Cependant ces filtres présentent généralement des zones d'accumulation des particules polluantes, ce qui crée des pertes de charge de l'écoulement de liquide entre l'entrée et la sortie du filtre.There are also self-cleaning effect filters centrifugal such as those described in particular in patents US 3807 568 and US 3718 258. However, these filters have generally areas of particle accumulation pollutants, which creates flow pressure losses of liquid between the inlet and the outlet of the filter.

Le but de l'invention est de réaliser un dispositif autolavable de séparation et de filtration de particules solides dans un débit de liquide présentant un encombrement et une masse réduite et permettant d'augmenter le rapport entre la quantité de débit de liquide filtré et la quantité de débit de liquide entrant dans le filtre tout en assurant un lavage efficace de la toile filtrante. The object of the invention is to provide a device self-cleaning particle separation and filtration solids in a cluttered liquid flow and a reduced mass and allowing to increase the ratio between the amount of filtered liquid flow and the amount of liquid flow entering the filter while ensuring effective washing of the filter cloth.

Pour cela, l'invention concerne un dispositif autolavable de séparation et de filtration dans lequel les particules solides les plus denses sont séparées par effet centrifuge pour préserver la toile filtrante d'une trop grande pollution. Les particules solides séparées sont directement acheminées vers la sortie du filtre et le débit de liquide qui traverse la toile filtrante ne contient que des particules solides résiduelles de faible densité qui restent piégées en faible proportion à la surface de la toile filtrante, la plupart des particules étant entraínée par la vitesse de fluide parallèlement à la surface de la toile.For this, the invention relates to a self-washing device for separation and filtration in which the particles denser solids are separated by centrifugal effect to protect the filter cloth from being too large pollution. The separated solid particles are directly routed to the filter outlet and the liquid flow which passes through the filter cloth contains only residual solid particles of low density which remain trapped in small proportion on the canvas surface filtering, most of the particles being entrained by the fluid velocity parallel to the surface of the fabric.

Selon l'invention, le dispositif autolavable de séparation et de filtration de particules solides dans un débit de liquide est défini par les caractéristiques de la revendication 1.According to the invention, the self-washing device for separation and filtration of solid particles in a liquid flow is defined by the features of claim 1.

L'invention concerne également une application du dispositif autolavable à un circuit d'injection en carburant caractérisée en ce que l'entrée tangentielle de liquide est reliée en aval d'une pompe haute pression, la sortie tangentielle de liquide est reliée en amont d'un filtre principal par l'intermédiaire d'une soupape de dérivation, la sortie longitudinale de liquide filtré est reliée à un dispositif de dosage de carburant.The invention also relates to an application of the device autolavable to a fuel injection system characterized in that the tangential entry of liquid is connected downstream of a high pressure pump, the outlet tangential of liquid is connected upstream of a filter main through a bypass valve the longitudinal outlet of filtered liquid is connected to a fuel metering device.

D'autres particularités et avantages de l'invention apparaitront clairement dans la suite de la description donnée à titre d'exemple non limitatif et faite en regard des figures annexées qui représentent :

  • la figure 1, une vue schématique en perspective d'un premier exemple du dispositif autolavable de séparation et de filtration de particules dans un débit de liquide,
  • la figure 2, une vue schématique en perspective d'un deuxième exemple de dispositif autolavable de séparation et de filtration de particules,
  • la figure 3, une vue schématique en coupe transversale d'un troisième exemple de dispositif autolavable de séparation et de filtration de particules, selon l'invention,
  • la figure 4, une vue schématique en coupe longitudinale du troisième exemple de dispositif autolavable de séparation et de filtration de particules,
  • la figure 5, un schéma d'un exemple d'application du dispositif autolavable de séparation et de filtration de particules dans un circuit d'injection en carburant.
Other features and advantages of the invention will appear clearly in the following description given by way of non-limiting example and made with reference to the appended figures which represent:
  • FIG. 1, a schematic perspective view of a first example of the self-washable device for separating and filtering particles in a liquid flow,
  • FIG. 2, a schematic perspective view of a second example of a self-washable device for separating and filtering particles,
  • FIG. 3, a schematic cross-sectional view of a third example of a self-washable device for separating and filtering particles, according to the invention,
  • FIG. 4, a schematic view in longitudinal section of the third example of a self-washable device for separating and filtering particles,
  • FIG. 5, a diagram of an example of application of the self-washing device for separating and filtering particles in a fuel injection circuit.

Le dispositif autolavable de séparation et de filtration de particules solides dans un débit de liquide comporte un carter 10 de forme tubulaire comportant une paroi périphérique, une paroi supérieure, une paroi inférieure, une chambre interne 11 délimitée par lesdites parois du carter, une entrée tangentielle 12 de liquide débouchant dans la chambre interne 11 à proximité de la paroi supérieure du carter 10 et une sortie tangentielle 13 de liquide aménagé à proximité de la paroi inférieure du carter 10. Une toile filtrante tubulaire 14 est montée longitudinalement dans la chambre interne 11, entre les parois supérieure et inférieure. La toile filtrante 14 comporte un conduit central longitudinal 15 débouchant en au moins une sortie longitudinale 16 de liquide filtré, la sortie longitudinale 16 étant aménagée dans la paroi supérieure et/ou inférieure du carter 10.The self-washing device for separation and filtration of solid particles in a liquid flow has a casing 10 of tubular shape having a wall peripheral, an upper wall, a lower wall, a internal chamber 11 delimited by said walls of the casing, a tangential inlet 12 of liquid opening into the internal chamber 11 near the upper wall of the casing 10 and a tangential outlet 13 of liquid arranged at near the bottom wall of the housing 10. A canvas tubular filter 14 is mounted longitudinally in the internal chamber 11, between the upper walls and lower. The filter cloth 14 has a central duct longitudinal 15 opening into at least one outlet 16 of filtered liquid, the longitudinal outlet 16 being arranged in the upper and / or lower wall housing 10.

La configuration tangentielle de l'entrée de liquide 12 permet de créer un vortex dans la chambre interne 11 pour séparer les particules solides les plus lourdes par effet centrifuge et les entrainer vers la sortie tangentielle 13 de fluide. Le débit de liquide qui traverse la toile filtrante ne comporte que des particules résiduelles de faible densité ce qui permet de préserver la toile filtrante d'une trop grande pollution et d'augmenter la quantité de débit de liquide filtré par rapport au débit de liquide d'entrée sans augmenter l'encombrement du dispositif autolavable de séparation et de filtration.The tangential configuration of the liquid inlet 12 creates a vortex in the internal chamber 11 to separate the heaviest solid particles by effect centrifugal and drag them to the tangential outlet 13 of fluid. The flow of liquid passing through the filter cloth contains only low density residual particles which preserves the filter cloth from too much great pollution and increase the amount of flow of liquid filtered in relation to the flow of inlet liquid without increase the size of the self-cleaning device by separation and filtration.

Préférentiellement, comme représenté sur la figure 3, au niveau de l'entrée tangentielle 12 de liquide, la surface intérieure du carter est en forme de spirale pour constituer une volute 31. Cette forme permet de maintenir constantes les vitesses d'écoulement radiales VR et tangentielles VT du débit de liquide autour de la toile filtrante 14, ce qui assure une répartition uniforme du débit de liquide filtré sur toute la surface latérale de la toile filtrante et une répartition uniforme de la vitesse tangentielle VT de lavage afin d'éviter la présence de zones d'accumulation des polluants.Preferably, as shown in Figure 3, at level of the tangential inlet 12 of liquid, the surface inside of the housing is in the form of a spiral to constitute a volute 31. This shape keeps the radial flow velocities VR and tangential VT of liquid flow around the filter cloth 14, which ensures a uniform distribution of the flow of filtered liquid over the entire lateral surface of the filter cloth and a uniform distribution of the tangential speed VT of washing in order to avoid the presence of areas of accumulation of pollutants.

Au niveau de la sortie tangentielle 13 de liquide, la surface interne du carter est également en spirale pour constituer une volute 32 de forme inversée par rapport à celle de la volute d'entrée afin de faciliter l'évacuation des particules solides vers la sortie tangentielle 13.At the tangential liquid outlet 13, the surface internal of the housing is also in a spiral to constitute a volute 32 of inverted shape with respect to that of the inlet volute to facilitate the evacuation of particles solids towards the tangential outlet 13.

Avantageusement, l'entrée 12 peut être une ouverture de faible épaisseur occupant toute la longueur du carter 10 afin que le VORTEX ait une vitesse de rotation homogène dans toute la chambre 11. Advantageously, the input 12 can be an opening of thin occupying the entire length of the casing 10 so that the VORTEX has a homogeneous speed of rotation throughout room 11.

Avantageusement, comme représenté sur la figure 4, entre les volutes d'entrée et de sortie, les sections internes du carter 10 sont croissantes et celles de la toile filtrante 14 sont décroissantes afin de minimiser les pertes de charge de l'écoulement de liquide entre l'entrée tangentielle et la sortie tangentielle de liquide.Advantageously, as shown in FIG. 4, between the input and output volutes, the internal sections of the casing 10 are increasing and those of the filter cloth 14 are decreasing in order to minimize the pressure losses of the flow of liquid between the tangential inlet and the tangential liquid outlet.

Pour une application à un circuit d'alimentation en carburant comportant un dispositif d'injection de carburant pour lequel le débit de carburant peut être filtré grossièrement, par exemple à 300µm, et des dispositifs d'asservissement pour lesquels le débit de carburant doit être filtré finement, par exemple entre 70 et 100µm, la toile filtrante est avantageusement constituée, comme représenté sur la figure 2, par la combinaison de deux zones de filtration 21, 22 ayant des pouvoirs d'arrêt différents. Les deux zones de filtration sont disposées dans la même chambre interne 11 du carter 10 et séparées par une cloison de séparation étanche 23. La première zone de filtration 21 ayant un pouvoir d'arrêt grossier comporte un conduit central longitudinal débouchant en une première sortie longitudinale 16 de liquide filtré aménagée dans la paroi supérieure du carter 10 et destinée à être reliée au dispositif d'injection de carburant filtré. La deuxième zone de filtration 22 ayant un pouvoir d'arrêt plus fin comporte un conduit central longitudinal débouchant en une deuxième sortie longitudinale 17 de liquide filtré aménagée dans la paroi inférieure du carter 10 et destinée à être reliée aux dispositifs d'asservissement.For application to a fuel supply system comprising a fuel injection device for which the fuel flow can be coarsely filtered, by example at 300µm, and servo devices for which the fuel flow must be finely filtered, by example between 70 and 100µm, the filter cloth is advantageously constituted, as shown in FIG. 2, by the combination of two filtration zones 21, 22 having different arresting powers. The two filtration zones are arranged in the same internal chamber 11 of the casing 10 and separated by a watertight partition 23. The first filtration zone 21 having a stopping power coarse has a longitudinal central duct opening out in a first longitudinal outlet 16 of filtered liquid fitted in the upper wall of the casing 10 and intended to be connected to the filtered fuel injection device. The second filtration zone 22 having more stopping power end has a longitudinal central duct opening into a second longitudinal outlet 17 for filtered liquid fitted in the lower wall of the casing 10 and intended to be connected to the servo devices.

En fonctionnement, un débit de liquide contenant des particules solides à séparer et à filtrer arrive sous haute pression dans la chambre interne 11 du carter 10 par l'entrée tangentielle 12 avec une vitesse tangentielle VT par rapport à la toile filtrante 14. Le débit de liquide est entrainé dans un mouvement hélicoïdal créant un vortex dans la chambre interne 11 entre la toile filtrante 14 et la paroi périphérique du carter 10. Sous l'effet des efforts centrifuges, les particules solides les plus denses contenues dans le débit de liquide sont propulsées vers l'extérieur du vortex le long de la paroi périphérique du carter 10, puis vers la paroi inférieure du carter 10. Ces particules solides denses sont, pour la plupart, évacuées directement vers la sortie tangentielle 13 de liquide. Le débit de liquide débarrassé des particules solides les plus denses mais contenant des fines particules solides résiduelles est entrainé au centre du vortex avec une vitesse tangentielle élevée par rapport à la surface de la toile filtrante.In operation, a flow of liquid containing solid particles to be separated and filtered arrive under high pressure in the internal chamber 11 of the casing 10 through the inlet tangential 12 with a tangential speed VT with respect to with the filter cloth 14. The liquid flow is entrained in a helical movement creating a vortex in the chamber internal 11 between the filter cloth 14 and the wall housing peripheral 10. Under the effect of efforts centrifugal, the densest solid particles contained in the liquid flow are propelled towards the outside of the vortex along the peripheral wall of the casing 10, then toward the bottom wall of the housing 10. These solid particles most of them are discharged directly to the tangential outlet 13 of liquid. Liquid flow rid of the densest solid particles but containing fine residual solid particles is entrained in the center of the vortex with a tangential speed high compared to the surface of the filter cloth.

Une première partie du débit de liquide située au centre du vortex traverse les mailles de la toile filtrante 14 à la surface de laquelle les particules solides résiduelles restent piégées. Le débit de fluide filtré débouche dans le conduit central longitudinal de la toile filtrante, puis est acheminé vers la sortie longitudinale de liquide filtré. La deuxième partie du débit de liquide est dirigée vers la sortie tangentielle 13 du liquide avec une vitesse tangentielle élevée par rapport à la surface de la toile filtrante 14. Au passage, cette deuxième partie du débit de liquide enlève les fines particules piégées à la surface de la toile filtrante et les entraine vers la sortie tangentielle 13 de liquide, ce qui a pour effet de laver la toile filtrante en permanence pendant toute la durée de fonctionnement du dispositif de séparation et de filtration. Cette deuxième partie du débit de liquide non filtré entraine également progressivement les particules solides les plus denses propulsées à l'extérieur du vortex, vers la sortie tangentielle 13 de liquide.A first part of the liquid flow located in the center of the vortex crosses the mesh of the filter cloth 14 at the surface of which residual solid particles remain trapped. The flow of filtered fluid flows into the longitudinal central duct of the filter cloth, then is routed to the longitudinal outlet of filtered liquid. The second part of the liquid flow is directed to the tangential outlet 13 of the liquid with a speed high tangential to the surface of the canvas filter 14. By the way, this second part of the flow of liquid removes fine particles trapped on the surface of the filter cloth and leads them to the outlet tangential 13 of liquid, which has the effect of washing the filter cloth permanently for the duration of operation of the separation and filtration device. This second part of the unfiltered liquid flow causes also gradually the most solid particles dense propelled outside the vortex, towards the exit tangential 13 of liquid.

La séparation des particules polluantes au moyen d'une centrifugation permet d'éloigner ces particules polluantes de la toile filtrante et d'augmenter la quantité de débit de liquide prélevé au travers de la toile filtrante par rapport à la quantité du débit de lavage de la toile filtrante tout en conservant un effet de lavage efficace. Le renforcement de l'effet de lavage par l'effet séparateur permet d'augmenter le rapport de débit filtré jusqu'à 50% du débit entrant sans augmenter les dimensions de la surface de la toile filtrante. Le dispositif de séparation et de filtration permet un gain de masse et d'encombrement et permet de mieux garantir l'inutilité d'une surveillance ou d'une opération de maintenance.The separation of polluting particles by means of a centrifugation removes these polluting particles from the filter cloth and increase the amount of flow of liquid withdrawn through the filter cloth relative to to the amount of the filter fabric wash flow all retaining an effective washing effect. Strengthening the washing effect by the separating effect increases the filtered flow ratio up to 50% of the incoming flow without increase the dimensions of the surface of the filter cloth. The separation and filtration device allows a gain of mass and size and allows to better guarantee the pointlessness of a surveillance or maintenance.

La figure 5 représente un schéma d'un exemple d'application du dispositif de séparation et de filtration dans un circuit d'injection en carburant.FIG. 5 represents a diagram of an example of application of the separation and filtration device in a circuit fuel injection.

Le circuit d'injection en carburant comporte une pompe basse pression 41 qui reçoit du carburant d'une pompe de gavage non représentée située dans un réservoir de carburant. Ce débit de carburant est envoyé à une pompe haute pression 42 au travers d'un filtre principal 43 situé en amont.The fuel injection circuit includes a low pump pressure 41 which receives fuel from a booster pump not shown located in a fuel tank. This flow fuel is sent to a high pressure pump 42 at through a main filter 43 located upstream.

En aval de la pompe haute pression, le débit de carburant Q1 traverse un dispositif de séparation et de filtration autolavable 44 conforme à l'invention. Le dispositif de séparation et de filtration 44 comporte une entrée et une sortie tangentielle de carburant et une toile filtrante munie d'un conduit central longitudinal débouchant sur une sortie longitudinale de liquide filtré. La sortie longitudinale est raccordée à un dispositif de dosage de carburant 45 en sortie duquel le débit de carburant dosé est dirigé vers des injecteurs de carburant 46. Au niveau du dispositif de séparation et de filtration 44, un prélèvement de débit de carburant Q2 est effectué au travers de la toile filtrante pour alimenter le dispositif de dosage de carburant. Le débit de carburant non prélevé Q3 est évacué vers la sortie tangentielle de carburant en entrainant toutes les particules solides séparées par effet centrifuge et toutes les particules piégées à la surface de la toile filtrante. Le débit de carburant Q3 est ensuite dirigé en retour au travers d'une soupape de dérivation 47 vers l'amont du filtre principal 43. L'ouverture de la soupape de dérivation 47 est commandée par un détecteur de différence de pression 48 branché en parallèle avec le dispositif de dosage 45. La commande délivrée par le détecteur de différence de pression 48 est élaborée de manière à maintenir constante la différence de pression PAV-PAM aux bornes du dispositif de dosage 45.Downstream of the high pressure pump, the fuel flow Q1 passes through a separation and filtration device autolavable 44 according to the invention. The device separation and filtration 44 has an inlet and a tangential fuel outlet and a filter cloth provided a longitudinal central duct leading to an outlet longitudinal of filtered liquid. The longitudinal exit is connected to a fuel metering device 45 at the outlet from which the metered fuel flow is directed to fuel injectors 46. At the level of the separation and filtration 44, a debit sample of Q2 fuel is carried through the filter cloth to supply the fuel metering device. The flow fuel not withdrawn Q3 is evacuated to the outlet tangential of fuel by entraining all the particles solids separated by centrifugal effect and all particles trapped on the surface of the filter cloth. The fuel flow Q3 is then directed back through a bypass valve 47 upstream of the filter main 43. The opening of the bypass valve 47 is controlled by a pressure difference detector 48 connected in parallel with the metering device 45. The command issued by the pressure difference detector 48 is designed to keep the PAV-PAM pressure difference across the device dosage 45.

Les dispositifs d'asservissement ne sont pas représentés sur le circuit d'injection de carburant de la figure 5 et le dispositif autolavable a une structure conforme à celle représentée à la figure 1.The servo devices are not shown on the fuel injection system of figure 5 and the self-washing device has a structure conforming to that shown in Figure 1.

Pour une application à un circuit d'injection de carburant comportant des dispositifs d'asservissement, le dispositif autolavable doit avoir une structure conforme à celle représentée à la figure 2.For application to a fuel injection system comprising servo devices, the device washable must have a structure conforming to that shown in Figure 2.

Claims (7)

  1. Self-washing device for separating and filtering solid particles in a liquid flow, comprising:
    a case (10) of tubular shape, comprising a peripheral wall, an upper wall and a lower wall;
    an internal chamber (11) bounded by the walls of the case (10);
    a tangential liquid inlet (12) running into the internal chamber (11) near the upper wall of the case (10), the tangential configuration of the inlet making it possible to create a vortex in the internal chamber (11) in order to separate the solid particles by centrifugal effect and to repel them to the periphery of the vortex;
    a tangential liquid outlet (13) provided near the lower wall of the case (10) in order to discharge the solid particles;
    a tubular filter cloth (14) mounted longitudinally in the internal chamber (11) between the upper and lower walls of the case in order to remove and filter some of the liquid located at the centre of the vortex, the filter cloth having a longitudinal central duct (15) running out into at least one longitudinal outlet (16) for filtered liquid;
    and characterized in that the case (10) has, at the tangential liquid inlet (12), an internal surface in the form of a spiral in order to constitute an inlet volute (31).
  2. Self-washing device according to Claim 1, characterized in that the case has, at the tangential liquid outlet (13), an internal surface in the form of a spiral in order to constitute an outlet volute (32).
  3. Self-washing device according to Claim 2, characterized in that, between the inlet and outlet volutes (31, 32) the case (10) has an increasing internal cross section and the filter cloth (14) has a decreasing internal cross section.
  4. Self-washing device according to Claim 1, characterized in that the filter cloth (14) is formed from first and second filtration regions (21, 22) having different stopping powers, the first filtration region (21) having a first longitudinal central duct running out into a first longitudinal outlet (16) for filtered liquid, provided in the upper wall of the case (10), and the second filtration region (22) having a second longitudinal central duct running out into a second longitudinal outlet (17) for filtered liquid, provided in the lower wall of the case (10).
  5. Self-washing device according to Claim 4, characterized in that the first and second filtration regions (21, 22) are separated by an impermeable separating partition (23).
  6. Application of the self-washing device according to any one of Claims 1 to 3 to a fuel injection circuit, characterized in that the tangential liquid inlet (12) is connected downstream of a high-pressure pump, the tangential liquid outlet (13) is connected upstream of a main filter (43) via a bypass valve (47) and the longitudinal outlet for filtered liquid is connected to a fuel metering device (45).
  7. Application of the self-washing device according to Claim 5, to a fuel injection circuit, characterized in that the tangential liquid inlet (12) is connected downstream of a high-pressure pump, the tangential liquid outlet (13) is connected upstream of a main filter (43) via a bypass valve (47), the first longitudinal outlet (16) for filtered liquid is connected to a fuel metering device (45) and the second longitudinal outlet (17) for filtered liquid is connected to servocontrol devices.
EP98403188A 1997-12-18 1998-12-17 Selfwashable device for separating and filtering solid particles in a liquid flow and use in a fuel injection system provided with such a device Expired - Lifetime EP0923972B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716058A FR2772635B1 (en) 1997-12-18 1997-12-18 AUTOLAVABLE DEVICE FOR SEPARATION AND FILTRATION OF SOLID PARTICLES IN A FLOW OF LIQUID AND APPLICATION TO A FUEL INJECTION CIRCUIT INCLUDING SUCH A DEVICE
FR9716058 1997-12-18

Publications (2)

Publication Number Publication Date
EP0923972A1 EP0923972A1 (en) 1999-06-23
EP0923972B1 true EP0923972B1 (en) 2004-04-14

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EP98403188A Expired - Lifetime EP0923972B1 (en) 1997-12-18 1998-12-17 Selfwashable device for separating and filtering solid particles in a liquid flow and use in a fuel injection system provided with such a device

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US (1) US6125826A (en)
EP (1) EP0923972B1 (en)
DE (1) DE69823145T2 (en)
ES (1) ES2221978T3 (en)
FR (1) FR2772635B1 (en)

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JP5629678B2 (en) * 2008-03-28 2014-11-26 イナジー・オートモーティブ・システムズ・リサーチ・（ソシエテ・アノニム） SCR system for purifying NOx exhaust gas
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Also Published As

Publication number Publication date
FR2772635B1 (en) 2000-06-16
FR2772635A1 (en) 1999-06-25
US6125826A (en) 2000-10-03
DE69823145T2 (en) 2005-03-17
ES2221978T3 (en) 2005-01-16
DE69823145D1 (en) 2004-05-19
EP0923972A1 (en) 1999-06-23

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